I see your Oblivion Remastered ghost horse that's either a fresh secret or Daedric-tier trolling, and raise you this totally invisihorse I've netted while investigating it

Right, so, there's an Oblivion Remastered clip that's been doing the rounds on Reddit. It appears - or so its poster claims - to show a player randomly discovering a weird ghostly horse just outside of Frostcrag Spire.